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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!

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hmm see if it is an desktop you actually have to press del to enter the setup ..for bios ..and if it is a laptop f2..and press it repeatedly..if you are not sure about the timing , soon after the first thing shown on the screen ..if it is a HP..you have to press F10 to enter set-up ..no matter if it is a laptop or a desktop ..cause they have this particularity in setting s..I repeat ..after the first thing apeared on screen ..press the needed button twice a second..like a clock ..and you will be sure you will catch the right moment ..

Unfortunately, you have a illegal copy of windows xp on your system. MS is dectecting that and disabling your windows. You can still buy windows xp off of third party website. Becareful doing so, the average price is $139 or so.

When your computer hardware appears to power up
okay, but the Windows XP operating system won't boot properly, you have to
begin a troubleshooting expedition that includes getting into the operating
system, determining the problem, and then fixing it. To help you get
started on this expedition, here are 10 things you can do when Windows XP won't
boot.Click here for more information

You will have to go into the program files and manually delete the operating system (os) not needed, make sure you have the right one. However, you will most likely still have the "choose your os" screen come up. The comand prompt that tells the machine to do this stays behind most of the time. If it does, then you will need to back up your files, reformat the hard drive, and install a new os.

try hooking up an external display and restore the settings , if that don't work you will need the operating disk to reinstall system files and you won't lose any data and the display settings will be restored

Your description of the symptom shows that your operating system installation has been corrupted. Fastest and easiest way to resolve the Issue using the "Recovery and application disk" (it comes with laptop) to perform full system recovery. I would like to remind you full system recovery will erase everything saved on Hard drive. You can check possible option on http://support.toshiba.com

If you dont have recovery and application disk you get one. You can call Toshiba @ 1-800-457-7777